Bio-environmental engineering, field and laboratory studies of solid waste management systems, landfill bioreactors, fracture flow hydrogeology and contaminant transport, design of ground water and soil bioremediation systems, disinfection electrotechnologies, modeling of environmental fate and transport of agricultural and industrial chemicals, environmental geochemistry, geographic information systems (GIS), innovative methods for engineering and technical education, environmental controls for agricultural structures, and rehabilitation and reutilization of old barns.